BEAMLESS PUMPING UNIT Russian patent published in 2013 - IPC F04B47/02 

FIELD: engines and pumps.

SUBSTANCE: beamless pumping unit includes support 1, gear motor 2 with nut 4 rigidly fixed on lower end of its driven shaft 3 and lead screw 5 with a strip thread, the lower end of which is connected to rod 6. On lead screw 5 there are paired opposite directed strip threads 7, 8; in each pair, upper outlets of strip threads, as well as their lower outputs, have smooth transition into each other, thus forming an endless strip. In nut 4 opposite each thread of lead screw 5 there is horizontally located through hole 9, into which coaxially located cylindrical casing 10 is inserted with possibility of being rotated and provided with a slot made in it in the form of a horizontal rectangle on the side of the lead screw. In slot 11 of cylindrical casing 10 there arranged with possibility of being rotated about vertical axis 12 is horizontally installed roller 13 with a part projecting to the outside of the slot, which is introduced to the thread of the endless strap. Driven gear motor 2 is made in the form of a pipe; lead screw is installed coaxially in the driven shaft from below; length of the driven shaft is more than that of a forward or backward stroke of the lead screw.

EFFECT: improving reliability and simplifying the control of electric motor operation.

2 cl